Yes it is possible DarkKnight. The generally held view on synastry and composite charts is composite charts reveal the relationship; the composite is the (unreal but accurate) chart of the relationship, whereas the synastries are what the couple Bring to the relationship; so my natal mixes with her natal (synastry); and our composite shows how our interaction will work out. You can even do progressions with composite charts, and so see how a relationship will develop over time. Composites work using the midpoints between the partners' major points and planets; thus in a composite you can have e.g. Venus or Mercury very far from the Sun, which would be impossible in a Natal or any real time chart. In one relationship I had, her Ascendant was/is Gemini, mine Capricorn; our composite Ascendant was/is Aries. Her Sun is Aries, mine Gemini; our composite Sun is Taurus. I hope that's clear. I don't have any clearer way of explaining it.

chris